• Title/Summary/Keyword: 연소효율

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Development of a Combustor in Portable Pellet Stoves Using Wood Pellets to Improve Combustion Efficiency and to Reduce Carbon Monoxide (CO) Emission (목재 펠릿(pellet)을 활용하는 휴대용 펠릿 난로의 연소 효율 향상과 일산화탄소(CO) 배출 저감을 위한 연소기 개발)

  • Min, Kyoung-Soon;Lim, Dae-Eun
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.40 no.3
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    • pp.315-320
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    • 2020
  • Pellets are manufactured using wood by-products. The combustion efficiency of pellets depends on the pellet manufacturing process, the types of materials mixed while manufacturing and the wood pellet stoves themselves. In this study, we developed a multi-layer combustor to be used in a wood pellet stove, for the purpose of reducing environmental pollution and energy waste due to incomplete combustion. The multi-layer combustor was designed to compensate for the shortcomings of existing combustors. A CAD (Computer Aided Design) model was verified using a 3D printer and a prototype was developed. The combustion experiments were conducted on commercial and proposed combustors using pellets of the same brand, manufacturing date, place and specifications. From the experiments, it was found that the proposed combustor produced the lowest carbon monoxide (CO) emission and highest thermal efficiency.

An Experimental Study of Shock Wave Effects on the Model Scramjet Combustor (모델 스크램제트 연소기에서 충격파 영향에 대한 실험적 연구)

  • 허환일
    • Journal of the Korean Society of Propulsion Engineers
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    • v.3 no.1
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    • pp.65-71
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    • 1999
  • An experimental study was carried out in order to investigate the effect of shock waves on the supersonic hydrogen-air jet flames stabilized in the Mach 2.5 model scramjet combustor. This experiment was the first reacting flow experiment interacting with shock waves. Two identical $10^{\cire}$ wedges were mounted on the diverging sidewalls of the combustor in order to produce oblique shock waves that interacted with the flame. Schlieren visualization pictures, wall static pressures, and combustion efficiency at two different air stagnation temperatures were measured and compared to corresponding flames without shock wave-flame interaction. It was observed that shock waves significantly altered the shape of supersonic jet flames, but had different effects on combustion efficiency depending on air temperatures. At the higher air stagnation temperature and higher fuel flow rates, combustion of efficiency showed a better result.

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가스터빈 고온부 정비기술

  • 김승태
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
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    • 1994.11a
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    • pp.51-58
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    • 1994
  • 가스터빈 발전은 연료를 연소하여 연소가스로 직접 터빈을 회전시켜 터빈에 연결된 발전기에 의해 발전하는 방식으로 연료로는 중유, 원유, 경유, 가스등을 사용한다. 주요설비는 공기압축기, 연소기, 터빈 및 발전기로 구성되며 이중 고온부는 연소기와 터빈이다. 가스터빈의 효율은 터빈입구온도(TIT : TBN INLET TEMP)에 의존하는데 현재까지 약 1,30$0^{\circ}C$ 급의 가스터빈이 운전중이며 앞으로 1,50$0^{\circ}C$ 급의 고효율 가스터빈에 도전하고 있으며 연소가스의 고온화는 고온부의 재료개발, 냉각기술, 코팅기법의 향상과 더불어 이루어질 수 있다. 가스터빈의 고온부 부품인 연소기, 터빈의 동익(Moving blade) 및 정익(Fixed blade) 재료로 초내열합금이 계속 개발중이며 또한 각 부품에 대한 공기냉각기술, 코팅재료 및 기법도 개발중이다. 그러나 현재 국내에서 가동중인 가스터빈은 빈번한 기동정지로 열 사이클에 의한 부품의 손상이 심각한 실정이므로 고효율 가스터빈 개발과 이에 대한 정비기술 개발이 병행하여야만 안정된 전기공급을 이룰 수 있다는 차원에서 가스터빈은 고온부품의 정비기술에 대한 그 현황과 전망에 대해 살펴보고자 한다.

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Development of Low NOx Combustor for 55kw Class Micro Gasturbine (55kW급 마이크로터빈용 저공해 연소기 개발)

  • Kim Hyung-Mo;Park Young-Il;Park Poo-Min;Yang Soo-Seok
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • v.y2005m4
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    • pp.318-321
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    • 2005
  • The design and performance test of a low NOx gas turbine combustor to be used in 55kW class micro-gasturbine engine was performed in KARI's combustion test facility. The combustor is reverse flow-can type for easy installation of injector and other parts and LNG is used as fuel. The performance targets are $99.5\%$ combustion efficiency, less 10ppm NOx, $30\%$ patten factor and $4\%$ pressure loss. Most of the performances required are satisfied.

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A Study on Combustion Characteristic of the Hybrid Combustor with Non-Combustible Diaphragm Position (비연소성 다이아프램의 설치 위치에 따른 하이브리드 연소기의 연소 특성 연구)

  • Kim, Hak-Chul;Moon, Keun-Hwan;Moon, Hee-Jang;Sung, Hong-Gye;Kim, Jin-Kon
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2012.05a
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    • pp.163-166
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    • 2012
  • The hybrid combustion were performed with the different diaphragm position for the experimental studies on characteristic of regression rate and combustion efficiency. The diaphragm was installed in 25% and 50% of fuel length from the front of solid fuel, respectively. As results of experiments, the position of diaphragm has small effect on the regression rate and combustion efficiency. It is considered that the diaphragm has local effect near the diaphragm.

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A Design of High Pressure Sub-scale Combustor and the Assessment of Combustion Efficiency (고압 축소형 연소기의 설계 및 연소효율 평가)

  • Lee, Kwang-Jin;Kim, Hong-Jip;Ryu, Chul-Sung;Han, Yeoung-Min;Choi, Hwan-Seok
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2006.11a
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    • pp.169-174
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    • 2006
  • This paper is related to a design of high pressure sub-scale combustor with regenerative reeling. As a previous step for the evaluation of thermal heat flux, a similar combustor with cooling water was manufactured. Design conditions with high combustion efficiency and cooling performance were verified through the hot firing tests of the water-cooled high pressure combustor. Finally the regeneratively cooled high pressure combustor has been designed based on these data. After manufacturing it, its practical utility will be tested and verified through hot firing tests.

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Concept Design of 1700kN class LRE System using UDMH-LOX(I) (1700kN급 UDMH-LOX 계열 액체로켓엔진 시스템 개념설계(I))

  • Gostev V.A.;Lim SeokHee
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2004.10a
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    • pp.157-161
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    • 2004
  • The colse type of engine system, in which the combustion gas after the gas-turbine with high temperature is supplied to the combustion chamber, was selected to increase the energy characteristics in making the rocket engine scheme which makes 1700kN thrust. The nozzle was designed with consideration of film cooling, nozzle efficiency, and the real state of cobmustion gas during the expansion in nozzle. The change of gas state and the composition of the gas through the nozzle was studied by the graphic, too.

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STUDY ON HEAT RELEASE RATE BY COMBUSTION IN DIESEL ENGINE (Diesel기관의 연소에 의한 열발생율의 연구)

  • AHN Soo Gil
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.8 no.3
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    • pp.150-156
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    • 1975
  • This paper dealt itself with the relation of the heat release rate with crank angle in combustion process by adjusting the injection time, injection amount and engine speed of diesel engine. The result of test were obtained by analyzing indicator diagram of KUBOTA 2LKE diesel engine, where the indicator was used Tertronix oscilloscope. The combustion period of diesel engine is composed of premixed burning time and combustion controlled time. The larger the premixed burning region, the higher efficiency was obtained with the higher maximum pressure than at the time of the normal smooth operation. The longer the combustion controlled time, the lower the maximum pressure than the period of the normal operation, but the efficiency was decreased. The region of premixed burning was principally controlled by injection delay, but combustion controlled time was affected when oxygen and fuel were mixed. Efficiency of engine was increased at the time of earlier injection time under the constant injection amount, and engine speed, but the pressure increasing was observed higher than the efficiency increasing.

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Reactive Flow Fields Analysis of End-Bunting Combustor with Different Impinging Type Injectors (End-Burning 연소기의 충돌형 산화제 주입기 형상 변화에 따른 연소유동장 해석)

  • Min, Moon-Ki;Kim, Soo-Jong;Yoon, Chang-Jin;Kim, Jin-Kon;Moon, Hee-Jang
    • Journal of the Korean Society of Propulsion Engineers
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    • v.11 no.5
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    • pp.51-59
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    • 2007
  • The end-burning combustion field using impinging oxidizer injectors are analyzed with tangential type injectors in order to examine their mixing and combustion characteristics. The impinging type showed further improved mixing effect as well as the combustion efficiency compared to the previously studied tangential injector. A novel injector capable of delivering impinging and swirl effect is introduced in this study where it demonstrated that the grain coning effect can be avoided. It was found that the combined impinging and swirling flow would promote the radial mixing rate increasing the residence time and the turbulent intensity. However, the use of the step combustor which may augment the turbulent intensity did not show any notable difference compared to the basic combustor.

Altitude Effects on the Performance of the Solid Fuel Ramjet (고체램제트 추진기관 성능에 미치는 고도의 영향)

  • Lee, Tae-Ho
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2007.04a
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    • pp.272-275
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    • 2007
  • The combustion efficiency of the solid fuel ramjet is affected by the inlet air temperature. And this inlet air temperature is dependent on the flight Mach number and the environment air temperature. If the flight altitude is changeable, the inlet air temperature and also the air density vary. The performance efficiency is investigated with this variables related to the combustion efficiency.

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